using Markdig;
using Microsoft.AspNetCore.Components;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Neighbourhood.omg.lol {
  public static class Utilities {

    private static MarkdownPipeline markdownPipeline { get; } 
      = new MarkdownPipelineBuilder().UseAutoLinks().Build();

    public static string MdToHtml(string markdown) =>
      Markdown.ToHtml(markdown, markdownPipeline);

    public static MarkupString MdToHtmlMarkup(string markdown) =>
      (MarkupString)MdToHtml(markdown);

    public static async Task<long> FileSize(FileResult file) {
      using var fileStream = await file.OpenReadAsync();
      return fileStream.Length;
    }

    public static async Task<string> Base64FromFile(FileResult file) {
      using var memoryStream = new MemoryStream();
      using var fileStream = await file.OpenReadAsync();
      await fileStream.CopyToAsync(memoryStream);
      byte[] bytes = memoryStream.ToArray();
      return Convert.ToBase64String(bytes);
    }

    public static string RelativeTimeFromUnix(long unix) {
      DateTimeOffset createdTime = DateTimeOffset.UnixEpoch.AddSeconds(unix);
      TimeSpan offset = DateTimeOffset.UtcNow - createdTime;

      var offsetString = string.Empty;
      if (Math.Floor(offset.TotalDays) == 1) offsetString = $"{Math.Floor(offset.TotalDays)} day ago";
      else if (offset.TotalDays > 1) offsetString = $"{Math.Floor(offset.TotalDays)} days ago";
      else if (Math.Floor(offset.TotalHours) == 1) offsetString = $"{Math.Floor(offset.TotalHours)} hour ago";
      else if (offset.TotalHours > 1) offsetString = $"{Math.Floor(offset.TotalHours)} hours ago";
      else if (Math.Floor(offset.TotalMinutes) == 1) offsetString = $"{Math.Floor(offset.TotalMinutes)} minute ago";
      else if (offset.TotalMinutes > 1) offsetString = $"{Math.Floor(offset.TotalMinutes)} minutes ago";
      else if (Math.Floor(offset.TotalSeconds) == 1) offsetString = $"{Math.Floor(offset.TotalSeconds)} second ago";
      else offsetString = $"{Math.Floor(offset.TotalSeconds)} seconds ago";

      return offsetString;
    }
  }
}